MP3318 3-Channel, 38V , OUT Linear/Exponential Dimming 2 Step-Up WLED Driver with I C DESCRIPTION FEATURES The MP3318 is a WLED step-up converter with 2.7V - 5.5V Input Voltage three current sinks and a 2.7 - 5.5V power supply 42V, 250m Internal MOSFET input. The MP3318 uses peak-current mode to 3-Channel Current Sink, Each Channel regulate the LED current set by the internal Enable/Disable Respectively register. LED Current Up to 25mA in Backlighting Mode The MP3318 integrates a 250m, 42V MOSFET. Linear or Exponential Analog Dimming The maximum LED voltage is up to 38V. The LED Current Up to 50mA in Flash Mode MP3318 is able to drive 10 LEDs in series for 11-Bit Dimming Resolution LCD panel applications larger than 5. Excellent LED Current Accuracy The MP3318 supports both linear and Excellent LED String Current Matching exponential analog dimming with 11-bit, ultra- 500kHz/1MHz Switching Frequency with high resolution to accurately regulate the Optional -12% Shift dimming current. Its auto-switching frequency Auto-Switching Frequency (250kHz, function can optimize the efficiency performance. 500kHz, 1MHz) Full protection features include LED open and 2 High-Speed I C Interface (1.2MHz) short protection, cycle-by-cycle current-limit Internal Soft Start to Reduce Inrush Current protection, and thermal shutdown. Current-Limit Protection (0.75A, 1A, 1.25A, 2 The I C interface can set the internal register to 1.5A) program the MP3318 for flexible applications, LED Open Protection (17V, 23V, 30V, 38V) such as dimming mode, LED current ramp, and LED Short Protection (2V, 3V, 5V) protection threshold. Available in a WLCSP-12 (1.3mmx1.7mm) The MP3318 is available in a tiny WLCSP-12 Package (1.3mmx1.7mm) package. APPLICATIONS Smartphones Tablets GPS Receivers LCD Video Displays with One-Cell Li-Ion Battery All MPS parts are lead-free, halogen-free, and adhere to the RoHS directive. For MPS green status, please visit the MPS website under Quality Assurance. MPS and The Future of Analog IC Technology are registered trademarks of Monolithic Power Systems, Inc. MP3318 Rev.1.0 www.MonolithicPower.com 1 10/17/2017 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. 2017 MPS. All Rights Reserved. 2 MP3318 3-CHANNEL, LINEAR/EXPONENTIAL DIMMING, WLED DRIVER W/ I C TYPICAL APPLICATION L1 Efficiency vs. ILED D1 VIN VIN = 3.8V, 3P8S, 10H, DCR = 280m C1 100% SW GND 90% C2 VIN VOUT 80% PWM PWM 70% MP3318 EN EN 60% SDA SDA 50% 1MHz Fsw LED1 SCL SCL 500kHz Fsw 40% LED2 250kHz Fsw GND LED3 30% GND 0 20 40 60 80 TOTAL ILED(mA) MP3318 Rev.1.0 www.MonolithicPower.com 2 10/17/2017 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. 2017 MPS. All Rights Reserved. EFFICIENCY